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a) 3
b) 9
c) 7
d) 5
correct answer is: b) 9
Explanation
\frac{4a\ -\ 1}{7}\ =\ \frac{3a\ +\ 3}{6}
\rightarrow6\left(4a-1\right)=7\left(3a+3\right) [cross multiply]
\rightarrow\ 24a\ -\ 6\ =\ 21a\ +\ 21
\rightarrow\ 24a\ -\ 21a\ =\ 21\ +\ 6
\rightarrow\ 3a\ =\ 27
\rightarrow\ a\ =\ \frac{27}{3}
\rightarrow\ a\ =\ 9
Ans: 9.
